﻿using MaterialDesignThemes.Wpf;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace Client.Todo.Common
{
    /// <summary>
    /// 对话主机服务(自定义)
    /// </summary>
    public class DialogHostService : DialogService, IDialogHostService
    {
        private readonly IContainerExtension containerExtension;

        public DialogHostService(IContainerExtension containerExtension) : base(containerExtension)
        {
            this.containerExtension = containerExtension;
        }

        public async Task<IDialogResult> ShowDialog(string name, IDialogParameters? dialogParameters = null, string dialogHostName = "RootDialog")
        {
            
            if(dialogParameters == null)
            {
                dialogParameters = new DialogParameters();
            }

            //从容器中取出弹出窗口的实例
            var content = containerExtension.Resolve<object>(name);


            //验证实例的有效性
            if (!(content is FrameworkElement dialogContent))
                throw new NullReferenceException("A dialog's content must be a FrameworkElement");

            if (dialogContent is FrameworkElement view && view.DataContext is null && ViewModelLocator.GetAutoWireViewModel(view) is null)
            {
                ViewModelLocator.SetAutoWireViewModel(view, true);
            }

            if (!(dialogContent.DataContext is IDialogHostAware viewModel))
                throw new NullReferenceException("A dialog's ViewModel must implement the IDialogHostService interface");

            viewModel.DialogHostNmae = dialogHostName;

            DialogOpenedEventHandler eventHandler = (sender, args) =>
            {
                if(viewModel is IDialogHostAware dialogHostAware)
                {
                    dialogHostAware.OnDialogOpened(dialogParameters);
                }
                args.Session.UpdateContent(dialogContent);
            };
            return (IDialogResult) await DialogHost.Show(dialogContent,viewModel.DialogHostNmae, eventHandler);
        }
    }

    public interface IDialogHostService:IDialogService
    {
        Task<IDialogResult> ShowDialog(string message,IDialogParameters dialogParameters,string dialogHostName= "RootDialog");
    }
}
